Torque converter



May 30, 1950 A. M. RossMAN.

'PORQUE CONVERTER Filed Sept. 27,

ging "and a ldriven member,

Patented May 30, 1950 y UNITED srrAfrss PATENT i. orifice i.

l 25509,:34'2 Y Y .Tonarm CONVERTER .allen ncssmanfwilmetre, nl. Application september 27, 1944, serial No. 556Mo v licolems. (C1. 'i4-42') .f .Y e w 1 i" This invention irelates to transmission devices Qfthecontinuously .variable type; and more .para ticolo/lily 2tofsouchfdeviccs as-oonvert rotary Imotion into variable :stroke reciprocating motion.. The

used in :any desired manner as, for instance, .for operating a reciprocating. mechanism such asa. reciprocating 'pump piston, which would. then `have a 'varia/bie stroke; or 'may be converted toV variable rotary motion wherein the amountfof nrotary.'motion produced lvaries as a function of 'me .one of meobjeetsof the present invention to provide a continuously variable typo of fmeclie llinism of the' class above .set forth wherein the change of speed .maybe :made whilethernecha'f msm-is in yoperation and wherein-.the permissi :ble-.range in speed change 4is :from zero to a mail'.u `imum in a istepless manner. Itis a still further v"llzljecto the vpresent .invention to provide a mechanism of the above mentioned 'character whch'will fbersimple and economical of construe'. tion andv eicient operation and. which. Inlay be?ccmtai'necl` in` 'a vsumstantially enclosed struth vthat can be v:readily attached between. a drive It is astili ffurther object vof; thepresent-ine vention to provide a speed changing mechanism of the above mentioned character where-in the transmission isismade bye, series of and '.l'evers wherein a angular stroke oi ancetr-- l -,illating member is "converted vinto a variable an- .guiarsttoke of .another oscillating. merxiloeix The attainment of the valo-ove and v,further obe -j'ects of.. the .presenty .invention wi1l-be apparent trom` the following speciicition 'taken' yin conh junction. with the accorinoanying.v drawing from; ving a part thereof. .ni the drawing.: A, s

Figure 1 isa diagrammatic view of a ylinkage `wloichis a part of the present invention;

Figure 2. is-:a side View of a speed. oh'ange'def i Reference .may now be hadto l'iu'e 1. .this figure thereis's'hovvn a drive shaft yI rotate able .about a, xed exis. on 'this drive siiet 'Tis mounted .a `frame jv2 of a e'nerally lifsllaiae, 1having tvvo .arms '3 and il.. gear "keyed tftli shaft 1I drives .a gear 'l V'mounted on a stud shaft a' .eerriedty thejarm 1l. The .gear '1f-is mounted on one .side of the -arn'i '4 and, on the opposite side of the arm 4.01'1 the saine stud lis kyed va sdisc 9. .A sprocket chain I`0 y connects the 'gears 6 .and '7. A connecting rod 'l2 'is fli'voted at one end I3 to the disc .9. .Thelopposite endm f the .connecting rod lis connected by a pivot to a 1`gli1 irig 'link whieh ,piveied tothe ana er l. `lt is thus .apparent that as the. disc .rotates the connecting 4rod ''2 actuates uthe guiding link in andarcuate path .I9 centered about the center .18. The 'iJJinlill oscillant-es along the arc T9 he'- tween the lirnitng .positions 2l and. A22, the length of stroke being determined by the distance. of the center .trom the eenlterV ci". an 2.5 of alengtli approximately equal to the length 'of the link His .pivoted about a hi'ed pivot .and is actuated by asecond link 2? which .is `otally `connectedatonehendr to the crank ami by a pivot ZSandpiw/otally connected. Aat .itsothef end. to thepivot I6, .sothat one end of 'the linl .21 moves along the arcuate .path t9 and the othei end is guided by the crank 25 and roclgs the end of the crank about Aan arcuate .path 3llwcentere'd at 26.` Although the amplitude of oscillation of the) point I6 remains constant, the 4ampli'tiiffle of oscillation of.'the'crank-Y 25 may vary from-zero .to amaximumdepending upon theangularpose 'tion of the Vframe 2, which determi-nes the .posie .tionyof the aro I9.. l Y A y If the entire frame 2 is turned aboutthe drive shaft'l as a center it is apparent that the locus t9 of the point I6 will alsol loe turnedr'abmit .the shaft I.- asyan eens,4 said locus I9 being always the arc o f 4a circle centered at the center .I8 on the arm 3;. Y Y A v Assume that the frame 2 is rotated in. a clock wise direction until the center.'l lt ntersects the arc. 39. The locus `are t9 will still be an are off?J lcircle'centered. about the new center v[8,.Whicl isthenon'th are. 3U. n is peifally ofa, length approxinatelythe sainerl'ength las eine llink. 211 Thereferethe center I8 andino, center Z will anni'Xr'natl'eli7 concide. I`f`fthy coincide, when thelink'vli. is oscllated the 'right hand. en d.. ofl the 2T, follows` tha la, :wii be moving about" the pvot .peine a center and the crank arm 25 will be stationary. On the other hand, if the frame 2 is rotated in a counter-clockwise direction until the point I8 is at a distance from the point 26 equal t the length of the link 21 the points IB, I8, 26 and 28 will constitute corners of a parallelogram of which the point 26 is a permanent xed point, and if the [point I8 is then held xed a movement of the link I1 along the locus I9 (which locus is in a xed relation with respect to the frame 2) will produce a corresponding move-ment of the point 28. It is thus apparent that by adjusting the position of the frame 2 about the shaft I and holding it in its adjusted position the amplitude of the oscillation of the crank 25 can be varied between zero and maximum limits to any value determined by the angular position in which the frame 2 is held.

Reference may now be had more particularly to Figures 2, 3 and 4 showing a specific embodiment of the present invention. In this embodiment there is shown at 3D a drive shaft which is rotatable about a fixed axis 3l and which may be driven in any desired manner, not shown, as by an internal combustion engine, a vconstant speed electric motor, or any other means. Concentrically mounted on this shaft and independently rotatable, is an adjusting sleeve 32. Rotatably mounted on the sleeve 32 vconcentric therewith and independently rotatable is a driven gear or ratchet 33. The gear or ratchet 33 has a sleeve 34 thereon which is suitably journalled in a supporting bearing 35.

A frame 38 is welded or otherwise secured to the adjusting sleeve 32 so that by turning of the sleeve the angular position of the frame may be adjusted, in a manner as will be more fully set forth as this description proceeds. The frame includes a channel member having flanges 39-39 (Fig. 3) and a web portion 40 which is welded to .the end of the sleeve 32. The frame 38 also includes a U-shaped member the arms 42-43 of which are joined by a bight portion 44. The ends 0f the flanges 39-39 are Welded to the arm 42. The drive shaft 30 lextends through the web 48 and into a round hole in the arm 42 and terminates at the inner surface of the arm 42. Within the channel 39-40 the shaft 38 has a sprocket gear 45 keyed thereto. The web 4I) has a downwardly projecting extension 48, and the arm 42 has a similar downwardly projecting extension A49. Between the bottom ends of these two projectionsthere is rotatably mounted a stud shaft 50 on which is keyed a sprocket gear 52 that is driven by the gear 46 through a sprocket chain 53. The stud shaft 50 passes through the downwardly extending projection 49 and has keyed thereto a disc 54 which is thus rotatable with the stud shaft.

The disc 54 operates a connecting rod 55 one end of which is pivoted to the disc by a pivot 6. Theopposite end of the connecting rod 55 is guided in an arcuate path by a U-shaped link 51. K The U-shaped link 51Vlies between the arms V42--43 and includes one armV 58 pivoted to the arm 43 by a short pin 59 and includes another arm 60 pivoted to the arm 42 by 4a short pin 6I, the pins SI1- 6I being in axial alignment. Each of the arms 58-60 of the guiding link 51 has a lobe or ear 63 between which lobes or ears the `end ofthe connecting rod 55 is pivotedas by a pivot pin YI'i4. The two ends of the arms 58-60 ofthe U-shaped guiding link 51 are joined together by a bight portion 68 to constitute the link 51 an integral structure. The link 51 is ac- 4 tuated by the connecting rod 55 and thus oscillates through a fixed arc about the centers of the pins 58-6I as an axis. The amplitude of this arc is determined entirely by the distance between the centers 58-56 on the disc 54. A second link 18 extends between the arms 58-58 of the link 51 and is pivoted to the arms 58-68 by a pin 1I. The opposite end of the link 10 is piv- Otally connected by a pin 14 to a crank 15 which is keyed to a rocker shaft 15. The crank 15 oscillates the shaft 1B. The shaft may be supported in any desired manner as, for instance, by bearings 11-11.

The frame 38 may be adjusted to any desired angular position, as by means of a handle 88 (Fig. 3), and held in that position. The angular position of the frame will determine the amplitude of oscillation of the shaft 16, as will be presently explained. y..

An explanation Will now be given of the mode of operation of the structure thus far described. Assume that the shaft 3U is rotating at a constant speed. Through the step-down gearing comprising the sprocket wheel 45, sprocket chain 53 and sprocket wheel 52 the drive shaft 30 rotates the disc 54 at a reduced constant speed. Assume now that the frame 38 has been adjusted to the position illustrated in Figure 6 and is held in that position. The rotating disc 54 `acting through the connecting rod55 oscillates the link 51 about the pin 6I so that the pin 1I moves over a fixed arc 83 the amplitude of 'which is determined by the distance between the centers 56-50. The crank arm 15 is of an effective length exactly equal to the length between the pivot axes 6I--1I. In thesposition illustrated in Figure 6 the distance between the pivot 6I and the center of the shaft 16 is exactly equal to the distance between the pivots 1I-14` It is thus apparent' that in the position illustrated in Figure 6 the pivot centers 6I-1I-14-16 constitute corners o'fa parallelogram of which the pivot 16 is a permanently 'fixed pivot and the pivot 6I "is held temporarily in the positionl illustrated in Figure 6. It is therefore apparent that oscillation of the link 51 will be transmitted to the Acrank 15 by the link 10 and that the crank 15 will therefore oscillate through an arcY exactly 'equal to the arc of oscillation of the link 51. Figure 6 represents the position of maximum amplitude of oscillation of the crank 15.

An explanation will now be given of the mode of action of the transmission when the trans'- mission is in its neutral position where no oscillation of the crank is desired. This is the position of the transmission illustrated in Figure l2. Assume that the frame 38 is rotated about the axis 3|, in a clockwise direction from the position illustrated in Figure 6 to that illustrated in Figure 2. In that position the rotation of the disc 54 still produces oscillation ofthe guiding link 51 through the same arcuate path 83. However, the locus 83 while fixed with 'respect to the frame 38 has now turnedthrough an angle of The arc is still centered about the pivot 6 I as a center. Due to the'proximity of the center 5I with the center 14 it is apparent that as the right hand end of the link 1o renews the arc 83 the left hand end will pivot about the center I4 and produce a negligible oscillation of theV center 14 and therefore negligible'oscillation `of'the crank A15 and of the shaft 16. This may be considered as the zero positionA of the transmission.

In any intermediate Aposition of Vthe transmisu sion the amplitude of oscillation of the crank 15 arms that actuate the 9L-93 S willfvary -fbetween zero and thei-maxmiumilimits) infaeoordance Jwithtlae'angleof therframei. -f `n'itermediate posit-ien is illustrated, lbyway lef -f example; in Fig-ure n'5. "Inthisfigure-theframei is shown a position between the positions illus tratedeini-Figures and 6. #Herethearc 83,':which represents the amplitude ofosci'llation of the llink 51 Lis again of the -sameilength =as iin `@ligure f6 ibut it eis apparent-,that as lthe point il I 'movesalong the Lare 83 "between its two'fextreme positionseit will Acauseithe peint iM,--w-hich-is thefiend of the erankarm d5, Lto oscillate between limits 'indicated at 81-.88,\Which represents asma'ller ramplitude o! Joscillation `Ythan the amplitude .of oscillation :of the-crank 125 vwhen the :frame-38 isainsthe position `illustrated -in Ylil-igure 1i.

A @he osoillatorymotion-,ofatheishaft 1.6 whiohis oto. controlled variable yamplitude@that may be varied from fzero Ato a maximum :may be aitilized in any desired manner. 'To :that effect stlie rook shaft :16 has yan arr-n 3D keyed thereto vwhich is :by the shaft. 'The Emotionof thearm -80 may tbe `transmittedfor. :the motion .of the arm l5 Amay be transmitted vto a :pump piston to prof vducefa variable stroke Lof a .pump plunger to ilary fthe napacity of the pump. Also, y.the variable .stroke oscillatory 4motion of .the arm 0 :may :be lsolarestad 4:into a variable Vsneed :rotary: motioneT-lus .is :illustrated vin Figure I7 @wherein :tlie .anni 3l! transmits .its oscillatory motion .rotate vthe vdriven gear or .ratchet :.33 by :means lof a double acting riant-1 device f9.1.. A:'llhemat/.1device may v.be of .a well :known :construction andiinoludes :a .pair

:sournailed fon :the bob 'bei tbe sateliet '33 .and earn'- iag oopositely disposed paul dif-94 to turn tbe ...3st, in `a manner well know-n .in '.:the fait.. lne sail. of .turning the trame 3.8 to produce rariatieos ...in the amplitude of oscillation of the shaft i6 the .equivalent `resnlt can be obtained by keeping the frame 38 ,stationary and .moving the center of tbe-snail; 1.6 ,about the 3l aS a reenter.

From the above description it is apparent that .-I. have provided a variable speed tizansmission o f tne .continuously variable .type vwherein the speed Aratio .may be eliansedin an .infinite .number of steps, the particular tranemissionirom .the oseillatory Shaft 18 to .the gear 33 being .here .shown merely -ioi illustrative purposes, .Since ,gearing ior converting variable oscillatory motion 'to variable .rotary vmotion are Weil Aknoiifri in lthe 'artlikewise, tlie power .for oscillating tbe link .51. over .the are 8.3 of .iiXea amplitude may be transmitted thereto inra .dinereat manner.

For instance, "the -,member ,54 may be driven by 'an electric Vmotor mounteddirectly onthe frame 'fin which case the sprocket `#I6 lwould be omitted. Alternately, if desired, vthe sprocket 46 may be replaced by a crank arm, and the frame 38 providedwith a series of links which'form a `parfallelogram `with the link 51, the parallelogram vbeing then actuated by a connecting rod joining fit with tne orank'arm.

' In compliance with the requirements of lthe4 variable transmission -typewnioh oomprises, a als trank :armi

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f 6 iframe mounted 'Ior angular :adjustment aboutus. xed axis, a rotatable driving member carried doy the etra-Ine and :movable lfliereiwiith iin fthe adjustmeri-t of :the trame, the driving Amemberibeing mountedwith '-itsaxis of -rotation spaced yLrorn said fixed taxis, 1a V2li-nkl pivoted onsaid ldrame, mea-ns connecting-'said link y.with ssaidmember for oseillating said link fthroug'h la .fixed :angle 'lof jose sill-ation, faerarik -arm :mounted :for :osoillatony movement about ani-axis Koutside of fsaid frame. anecond Tlink pivotedf-to the crank arm and pit/1f Yated 1'to' the Lfirst-link ewhereby ione end off 4'the .seca -ondfllink `has an osc'illatoisy vmotion determined iby the first link, -n one position-of itheframesthe @pivot -axlisfof ltine -lrs't linklbeing adjacent the pivotalconnection between the crank arm :and the #secondllfinkwhereby the :amplitude nof oscila `'lation of the Vcrank arm :a minimumand means for "turn-ing the iframe about said :fixed axis from -sa'id one 4 position in la direotionemoving the-:pivot vof Lthe l`first link with said frame away from the connect-ion between-the ysecond linkv and Lthefora-nk `arm through anangle at 'least-approximating '-9,6" tof-increase -the iamplitude -of oscillation of "iih' -orank-arm.

A rspeed change Kdevice of the oontinu.onsly variable transmission type which comprises rairo tatable Yshaft, a lframe mounted for iangul'arfad- :justment about an axis ,coincident with :the axis lof-the shalt, a vrotatable remember ycarried by :the fra-ine and lrotatable about an axis spaced :from the longitudinal axis -of the shaft, ,a :driving com fnection y'interconneotirig said member and the shaft, a lli-rik pivoted on said iframe, Vmeans connecting xsaid link Withfsaid member forzo'seillat ing said link 4through a fixed angle of oscillation, a, crank armemounted for oscillatory ,movement about an axis loutside of said drame., .a second :link -pivoted to fthe crank zarm Vand fpivoltedfto the first link whereby Aone .end of the second 'link has Van .oscillatory motion .determined :by :the rst link, in one'position lof the iframe the pivot :axis :of nrst 'link being ad-jaeent the pivotal connection between the crank arm and .the second link whereby the amplitude efsoseillation Vof tbefnrank arm alminimum, and means. for turning 'the iframe :from .said :one position through .gan-angle at :least-approximating 190? vto increase .the ame vplitude Vof 'oscillation of `the ycrank B. Aspeed change .device of the continuously ivariable transmission 'type which :comprises oon lcerrtricl .driving and Ydriven .fazIiiame nnmnted for angular :adjustment about an :asis coincident with the axes of the shafts, a .rotatable member .carried by the frame and with its axis of rotation parallel :to .andspaced fromtheiong-i tudinalaxis oi Ythe snai-ts, .means includiiisfa sneedwreducins searing coupling -Said .member with :the driving shaft, ,a rpivoted; onl said :fr-ame; means foonneetine csaid .link .with said :member fior oscillating .saidlink through a-nxed fansleioioseiilaton, a crank arm-.mounted for os- 4aillatory.iuioveinent .an axis outside of :said Itrame., a secolo@ llink, riveted to the `crank arm and pivoted to the rst lirilsiwhereby -one endrDf he seoond'link Ahais/:anti oscillatory Imoticm :determined bythe rst link, infone position othe. frame vthe nii/ataxia of the .first `link being adiaoent the pivotal seonnection .between ,the crank arm and the second link whereby the-amplitude of Ioscillation of Ithe crank. :arm .isa minimum, v-lfirieaue :for .turning the yframe fromsaid one .posiztion through fan .ansie 'at 1eaataproXimatingv-.9v .to increase theamplitude of oscillation off-the and means forming a .driving 7 nection between said crank shaft.- Y j 4.- A speed change device of the continuously variable transmission type which comprises, a driving shaft, a frame mounted for angular adjustment about an axis coincident with the axis of the shaft, Va rotatable member carried by the frame, means including a speed reducing gearing coupling said member with the driving shaft, a link pivoted on said frame, means connecting said link with said member for oscillating said link through a xed angle of oscillation, a crank arm mounted for oscillatory movement about an axis outside of said frame, a second link pivoted tothe crank arm and pivoted to the first link whereby one end of the second link has an oscillatory motion determined by the first link, in one position of the frame the pivot axis of the first link being adjacent the pivotal connection between the crank arm and the second link whereby the amplitude of oscillation of the crank arm is a minimum, means for turning the frame from said one position through an angle at least approximating 90 to increase the amplitude of oscillation of the crankarm, a driven shaft, and means forming a driving connection between said crank` arm and the driven shaft.

,5. A speed change device of the continuously variable transmission type which comprises, a frame mounted for angular movement about a fixed axis, a driving member carried by the frame and movable therewith in the adjustment of the frame, a link pivoted on said frame, a connecting rod connecting said link with said member for oscillating said link through a fixed angle of oscillation, a crank arm mounted for oscillatory movement about an axis outside of said frame,

arm and the driven a second link pivoted to the crank arm and pivotframe mounted for angular movement about a fixed axis, a driving member carried by the frame and movable therewith in the adjustment of the frame, a link pivoted on said frame, a connecting rod connecting said link with said member `for ond link pivoted to the crank arm and pivotallyconnected to the first link whereby one end of the second link has an oscillatory motion determined by the first link, and means for turning fthe frame through an angle at least approximating 90 to change the amplitude of oscillation vof the crank arm, the axis of movement of the frame being parallel to the pivotal axis of the first mentioned link and located substantially midway of the arc of oscillation of the connec- -tion between the two links.

' 7. In a speed change device of the continuously variable transmission type, a frame, a link pivoted on the frame about an axis fixed with respect to the frame, means including a rotatable member carried by the frame and a connection `between said member and said link for oscillating the link over an arc xed with respect to the frame, means forming a pivotal support for the zframe for turning the frame about an axis paralle! tothe 'pivot axis of the link and located sub- .armwof an amplitude determined by the yposition of the frame.

stantially midway oi the extremes of oscillation ofthe endvof the link, a crank arm pivoted about an axis outside of the frame, and means including -a connecting rod joining the crank with the crank vwith the link for oscillating the link, a crank arm pivoted for swinging movement about an axis outside of the frame, a second link pivoted to the crank arm, means pivotally connecting the two links, in one position of the device the center of the rst link being adjacent the pivoted connection of the second link with the crank, and -meansfor Vproducing Aa relative change in posi- Ytion as between the frame and the crank arm axis by 'turning one withrespect to the other. 9. In a speed change device of the continuously Yvariable transmission type, a frame, a link pivotally mounted on the frame, a rotary driving member mounted on the frame, a connecting rod connecting the rotary member with the link for oscillating the link, a crank arm pivoted for swinging movement about an axis outside of the frame, a second link pivoted to the crank arm, means pivotally connecting the two links, in one position of the device the center of the first link being adjacent the pivoted connection of the second link with the crank, and means for producing a relative change in position as between the frame and the crank arm axis by turning one `with'respect to the other about an axis passing through the frame and substantially midway of the are of oscillation of the rst link, the device having a range of turning from said one position at leastY up to a position where the second link makes approximately the same angle with the first link that it makes with the crank arm.

10. A speed change device comprising a crank arm vmovable about a, rst fixed axis, a rst link pivoted to said crank arm, a frame movable about a second fixed axis, a second link pivoted to said frame, means pivotally connecting said two links, means mounted on the frame for oscillating said second link abo-ut its pivot axis on the frame through an'arc of a xed length, said means being movable with said frame about said second Vxed axis, means for positioning the said frame about the second vaxis to any position within a range of approximately whereby the movement of the pivot connecting means of the two .links is translated into a movement of the pivot connection between the rst link and the crank angular 11. Mechanism for converting motion as between rotary motion and variable stroke oscillating motion, said mechanism comprising a power transmitting member, means guiding one end thereof for oscillation, means guiding the other end thereof for movement over an arc of xed amplitude, said last named means compris- Iing a pivoted link and a rotatable crank and a connecting, rod Vconnecting the link with the crank, the centers of movement of the link and the crank being xedrwith respect to one another whereby theV amplitude of oscillation of said other end of the/powertransmitting member is constant, a common support for said two centers, and means forvturning the common support with Arespect .to the means for guiding said one end of the power transmitting member, whereby the relative angularity of the loci of the two ends of Vthe power transmitting member is changed to change the relative strokes of the two ends of said member.

12. Mechanism for converting motion as between rotary motion and variable stroke oscillating motion, said mechanism comprising a power transmitting member, means guiding one end thereof for oscillation, means guiding the other end thereof for Ymovement over an arc of xed amplitude, said last named means comprising a pivoted link and a rotatable crank and a connecting rod connecting the link with the crank, the centers of movement of the link and the crank being fixed with respect to one another whereby the amplitude of oscillation of said other end of the power transmitting member is constant, a common support for said two centers, and means for turning the common support about an axis midway of the arc of travel of said other end of the power transmitting member, whereby the relative angularity oi the loci of the two ends of the power transmitting member is changed to change the relative strokes ofthe two ends of said member.

13. A speed change device of the continuously variable transmission type which comprises, a

Vframe mounted for angular adjustment about a xed axis, a rotatable driving member carried by the frame and movable therewith in the adjustl ment of the frame, the driving member being mounted with its axis of rotation spaced from said xed axis, a link pivoted on said frame,

means connecting said link with said member for oscillating said link through a xed angle of oscillation, and means for turning the frame about 'said xed axis through an angle at least approximating 90.

14, A speed change device of the continuously 40 variable transmission type which comprises a rotatable shaft, a frame mounted for angular adjustment about an axis coincident with the axis of the shaft, a rotatable member carried by the frame and rotatable about an axis spaced from the longitudinal axis of the shaft, a driving connection interconnecting said member and the shaft, a link pivoted on said frame, means connecting said link with said member for oscillating said link through a xed angle of oscillation, and means for turning the frame from said one position through an angle at least approximating 90.

15. I-n a speed change device of the continuously variable transmission type, a frame, a link pivoted Von the frame Vabout an axis xed with respect to the frame, means including a rotatable member carried by the frame, a connection between'said member and said link for oscillating the link over an arc iixed with respect to the frame, and means forming a pivotal support for the frame for turning the frame about an axis parallel to the pivot axis of the link and located substantially midway of the extremes of oscillation of the end of the link.

16. Mechanism for converting motion as between rotary motion and variable stroke oscillating motion, said mechanism comprising a frame mounted for angular adjustment about a xed axis, a rotatable driving member carried by the frame and movable therewith in the adjustment of the frame, the driving member being mounted with its axis of rotation spaced from said fixed axis, a link pivoted on said frame and means connecting said link with said member for oscillating said link through a fixed angle of oscillation.

ALLEN M. ROSSMAN.

REFERENCES CITED The following references are of record in the iile of this patent:

VUNITED STATES PATENTS Number Name Date 252,176 Breed Jan. 10, 1882 274,094 Miller Mar. 13, 1883 1,682,500 Getz Aug. 28, 1928 1,968,030 De Filipis July 31, 1934 2,305,128 Andresen et al Dec. 15, 1942 Certificate of Correction Patent No. 2,509,842 May 3o, 195o ALLEN M. ROSSMAN It is hereby certifie@ that errors appear 'm the prmted specicaton of the above numbered patent requlrmg correction as follows:

Column 6, line 63, after the Word movement insert about; line 66, for and after has read an; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Ofce.

Signed and sealed thls 15th day of August, A.. D. 1950.

THOMAS F. MURPHY,

Assistant Commissioner of Patents. 

